New Delhi, July 30 -- The Federal Aviation Administration's Part 135 air carrier certification is the credential that allows a company to conduct commercial drone operations legally in the United States. DoorDash received one Wednesday, and announced it intends to fly things to your door using aircraft it built itself.

the company is building its own aircraft, training its own operators, and now holds its own certification to fly them commercially.

Stanley Tang, DoorDash's co-founder and chief product officer, described the engineering approach in terms of the problem it was trying to solve rather than the technology it was trying to deploy. "We didn't start with the question, 'What's the coolest autonomous tech we could make?' We start...